Use a change of variables to find the indefinite integral xe^(x^2) dx

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?